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java.lang.NullPointerException: 	at processing.core.PApplet.join(PApplet.java:8950)	at de.fhpotsdam.unfolding.data.GeoJSONReader.loadData(Unknown Source)	at Map.setup(Map.java:45)	at processing.core.PApplet.handleDraw(PApplet.java:2361)	at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:240)	at processing.core.PApplet.run(PApplet.java:2256)	at java.lang.Thread.run(Unknown Source)